J. Niel de Beaudrap, Vincent Danos, Elham Kashefi, Martin Rötteler. Quadratic Form Expansions for Unitaries. In Yasuhito Kawano, Michele Mosca, editors, Theory of Quantum Computation, Communication, and Cryptography, Third Workshop, TQC 2008, Tokyo, Japan, January 30 - February 1, 2008. Revised Selected Papers. Volume 5106 of Lecture Notes in Computer Science, pages 29-46, Springer, 2008. [doi]
Abstract is missing.